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Response snapshot Oct 31, 2026, 01:26 UTC

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VulnerabilityGHSA-7wpf-ch8f-5f4x

signalk-server has SSRF via absolute signalk.appIcon URL in the app store icon fetcher

The app store icon code (dist/appstore/icon-probe.js around line 200 and icon-bytes.js around line 138) resolves a plugin's declared signalk.appIcon.

At a glance

Exploited
Not known
Severity
Not scored yet
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: signalk-server: 2.34.0. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-7wpf-ch8f-5f4x (opens a new tab)

What happened

Summary

The app store icon code (dist/appstore/icon-probe.js around line 200 and icon-bytes.js around line 138) resolves a plugin's declared signalk.appIcon. Relative paths are pinned to the CDN, but an absolute http(s) URL is used as-is: the server fetches it, follows redirects, and stores any image/* response as the plugin's icon, which is then served to the admin UI. Unrelated to GHSA-q59x-jc9f-gfqf.

Affected

signalk-server 2.33.0 (latest).

Continue reading

Reproduction

The real dist modules driven directly, Docker with --network none; a local "internal" service on 127.0.0.1 logs requests:

[CONTROL relative] declared=../../icon.png
 resolved=null
 internal-service hits: [] stored: null
[ATTACK absolute] declared=http://127.0.0.1:35013/latest/meta-data/iam
 resolved=http://127.0.0.1:35013/latest/meta-data/iam
 internal-service hits: ["GET /latest/meta-data/iam"] stored: .../icon-bytes/evil-plugin@1.0.0.png (70 bytes)
[ATTACK redirect] declared=http://127.0.0.1:35013/redir
 internal-service hits: ["GET /redir","GET /internal-secret-via-redirect.png"] stored: .../icon-bytes/evil-plugin@1.0.0.png (70 bytes)

The modules were tested directly rather than through a full running server.

Impact

Anyone who can get a plugin listed in the app store (publishing an npm package with the signalk keywords) can make every signalk-server that browses the app store send requests to internal addresses on the vessel network and to cloud metadata endpoints. Responses with an image content type are stored and served back to the user.

Suggested fix

Only accept relative icon paths resolved against the CDN (or an https allowlist of known hosts), do not follow redirects to other hosts, and reject private, loopback and link-local addresses after resolution.

Affected package ranges reported by GitHub: signalk-server: >= 2.28.0-beta.2, < 2.34.0

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-7wpf-ch8f-5f4x (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-7wpf-ch8f-5f4x, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 30). signalk-server has SSRF via absolute signalk.appIcon URL in the app store icon fetcher. https://kevwire.com/record/GHSA-7wpf-ch8f-5f4x

MLA

"signalk-server has SSRF via absolute signalk.appIcon URL in the app store icon fetcher." KEVWire, 30 Oct. 2026, kevwire.com/record/GHSA-7wpf-ch8f-5f4x.

Chicago

KEVWire. "signalk-server has SSRF via absolute signalk.appIcon URL in the app store icon fetcher." Last modified October 30, 2026. https://kevwire.com/record/GHSA-7wpf-ch8f-5f4x.

Evidence summary (plain text)

signalk-server has SSRF via absolute signalk.appIcon URL in the app store icon fetcher (Oct 30, 2026).
The app store icon code (dist/appstore/icon-probe.js around line 200 and icon-bytes.js around line 138) resolves a plugin's declared signalk.appIcon. Relative paths are pinned to the CDN, but an absolute http(s) URL is used as-is: the server fetches it, follows redirects, and stores any image/* response as the plugin's icon, which is then served to the admin UI. Unrelated to GHSA-q59x-jc9f-gfqf.

signalk-server 2.33.0 (latest).
Sources:
GitHub-reviewed advisory GHSA-7wpf-ch8f-5f4x: https://github.com/advisories/GHSA-7wpf-ch8f-5f4x
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: GHSA-7wpf-ch8f-5f4x.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 31, 2026, 00:50 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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